Thermal Shrinkage – all materials shrink and expand with changes in temperature.As with most materials that dry out they begin to shrink causing hairline cracks to appear. Drying Shrinkage – as concrete cures and goes through it’s chemical reaction between the water and cement particles it begins to “dry” out.Some of the factors that can cause concrete cracks are: There are many factors that cause concrete to crack. So you end up with a composite material, the concrete takes the compressive loads and the steel rebar takes the tensile forces. That’s why concrete is reinforced with steel reinforcing called rebar. Concrete has very strong compressive strength and very poor tensile strength. Why Does Concrete Crack?Ĭoncrete cracks when it is subjected to tensile stress (forces that pull apart on something vs forces that push together something). While it’s a natural reaction to be concerned when you see something cracked the reality is that 95% of cracks in concrete are harmless and nothing to worry about. Many home owners are nervous when they see cracks in concrete and wonder if they are bad or dangerous. I often get asked about cracks in concrete foundations.
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